Sweetpotato plant named &#39;NCORNSP-015SCPI&#39;

ABSTRACT

‘NCORNSP-015SCPI’ is new and distinct variety of ornamental sweetpotato plant. ‘NCORNSP-015SCPI’ is a compact, semi-upright; mounding, cultivar producing many short shoots. This ornamental sweetpotato variety is distinguishable from other cultivars by its dark purple leaves that have 3-5 moderate lobes, a compact habit, and semi-erect mounding plant architecture. ‘NCORNSP-015SCPI’ has a very good vigor and is very well branched. It is less vigorous than  Ipomoea batatas  ‘Margarita’ and ‘Blackie’ and is well suited for production as a landscape or containerized plant. ‘NCORNSP-015SCPI’ holds it leaves upright compared with the slightly curled leaves of ‘Sweet Caroline Purple resulting in a more upright appearance. Unlike ‘Sweet Caroline Purple’, which rarely produces flowers, ‘NCORNSP-015SCPI’ will produce flowers under short day conditions.

LATIN NAME OF THE GENUS AND SPECIES

Ipomoea batatas (L.) Lam.

VARIETY DENOMINATION

‘NCORNSP-015SCPI’.

BACKGROUND

Ipomoea batatas is a member of the morning glory family Convolvulaceae. This species is grown worldwide and exhibits a wide range of plant forms and colors. The cultivated members of Ipomoea batatas that are grown by farmers are commonly produced for consumption of their enlarged storage roots. Such plants typically produce a fast growing green vine that has a wide variety of leaf shapes ranging from palmate and deeply lobed, to cordate or triangular shaped leaves with no lobes.

Ornamental sweetpotato plants, like their edible forms, are a heat-loving, drought tolerant, perennial vine, typically grown as an annual. However, ornamental sweetpotato plants are distinguished from the edible cultivated forms in that they possess unique foliage colors, leaf shapes, and growth habits, which have significant value in the ornamental marketplace.

Ornamental sweetpotatoes are desirable in the landscape and ornamental industries because their foliage comes in a wide variety of colors (e.g. pale yellow to dark purple with some exhibiting temporal and individual leaf color variegation patterns) and plant shapes (e.g. mounded and very compact to prostrate and highly spreading). They can be grown in a potted plant and/or mixed planting format, and they have the ability to cover a large space or hang over walls and decorative pots creating brightly colored and textured backdrops in gardens and patios. Most ornamental sweetpotatoes grow and last the entire growing season and they require little maintenance. Moreover, these plants have few insect or disease problems.

Applicants desire to produce new cultivars of ornamental sweetpotato with new or improved foliage colors, variegation patterns, leaf shapes, and plant architectures. In addition, applicants believe it would be advantageous to develop cultivars of ornamental sweetpotato exhibiting a more compact growth that do not out-compete other species in mixed containers.

‘NCORNSP-015SCPI’ addresses at least one of the above-mentioned needs.

Lineage. ‘NCORNSP-015SCPI’ (breeding designation NC4626-002ORN) originated from open pollinated seed harvested from the proprietary Ipomoea batatas breeding line NC1926-001ORN (the female parent; not patented). Botanical seed was harvested from this and other ornamental sweetpotato lines planted in our winter greenhouse crossing block between September of 2005 and April of 2006 in Raleigh, N.C. NC1926-001ORN resulted from open pollinated seed harvested from the proprietary Ipomoea batatas breeding line ‘NCN36-001ORN’ (the female parent; not patented). Botanical seed from this half-sib family were planted in the greenhouses in Spring 2006. The first cycle of selection on the population was exercised in the seedling trays and survivors were transferred to a single 6-inch pot, which was then maintained in the greenhouse. Cuttings (2 each) were taken from the plants in May and planted in the field as 2-plant unreplicated plots during early July 2006. The single, individual plant now known as ‘NCORNSP-015SCPI’ was selected Sep. 26, 2006 because of its combination of exceptional features, and has been Sep. 26, 2006 because of its combination of exceptional features, and has been propagated asexually since that time.

Asexual Reproduction. Since its selection, Ipomoea batatas ‘NCORNSP-015SCPI’ has been asexually reproduced in North Carolina predominantly by vegetative propagation of vine cuttings. Successively, there have been five cycles of vegetative propagation, one cycle of tissue culture micropropagation, and multiple vegetative propagation cycles to increase the plant population. Asexual reproduction of ‘NCORNSP-015SCPI’ by cuttings has shown that the unique features of the new cultivar are stable and the plant reproduces true to type in successive generations.

REFERENCE TO PLANT BREEDERS RIGHTS

Plant Breeders Rights for ‘NCORNSP-015SCPI’ have not been applied for. ‘NCORNSP-015SCPI’ has not been made publicly available or sold more than one year prior to the date of this application.

SUMMARY OF THE INVENTION

‘NCORNSP-015SCPI’ is a compact, semi-upright; mounding, spreading variety producing many short shoots. It is distinguishable from other cultivars by its dark purple leaves that have 3-5 moderate lobes, a compact habit and semi-erect mounding plant architecture. The extremely dark purple feature of the color of this plant and the plant architecture makes ‘NCORNSP-015SCPI’ unique amongst the current ornamental sweetpotatoes in the marketplace. ‘NCORNSP-015SCPI’ also exhibits very good vigor and is very well branched. In greenhouse and field trials conducted during 2006 to present by the breeding program and industry collaborators ‘NCORNSP-015SCPI’ has been shown to be much less vigorous than Ipomoea batatas ‘Margarita’ and ‘Blackie’ and is suitable for use as a landscape or containerized plant. The production of flowers by ‘NCORNSP-015SCPI’ is moderate under short day conditions.

BRIEF DESCRIPTION OF THE DRAWINGS

The photographs in the drawings were made using conventional techniques and show the colors as true as reasonably possible by conventional photography. Colors in the photographs may differ slightly from the color values cited in the detailed botanical description, which accurately describe the colors of the new Ipomoea batatas.

FIG. 1 is a color photograph of a typical specimen of greenhouse grown Ipomoea batatas ‘NCORNSP-015SCPI’ in a 6-inch pot from the side and top, 62 days after planting.

FIG. 2 is a color photograph of a typical specimen of Ipomoea batatas ‘NCORNSP-015SCPI’ from the side and top in the field, 53 days after planting.

FIG. 3 is a color photograph showing the variety of leaves produced by Ipomoea batatas ‘NCORNSP-015SCPI’ and the lower surface of the leaf (bottom row, center leaf).

DETAILED BOTANICAL DESCRIPTION OF THE NEW VARIETY

The following is a detailed description of the botanical characteristics of a new and distinct cultivar of Ipomoea batatas plant known by the cultivar name Ipomoea batatas ‘NCORNSP-015SCPI’. All colors cited herein refer to The Royal Horticultural Society Colour Chart designations (The Royal Horticultural Society, London, 2007, 5^(th) ed. except where general terms of ordinary dictionary significance are used. Plant descriptions are based on the standardized international sweetpotato descriptors established jointly by the International Potato Center (CIP), Lima, Peru; The Asian Vegetable Research and Development Center (AVRDC), Taipei, Taiwan; and the International Board for Plant Genetic Resources (IBPGR), Rome, Italy (CIP, AVRDC, IBPGR. 1991. Descriptors for Sweet Potato. Huaman, Z., editor. International Board for Plant Genetic Resources, Rome, Italy, I34pp.). Where dimensions, sizes, colors, and other characteristics are given, it is to be understood that such characteristics are approximations or averages set forth as accurately as practicable.

The descriptions reported herein are from 62-day-old specimens grown individually in six-inch azalea pots. The plants were grown in Raleigh, N.C., under commercial practice in a glass-covered greenhouse, where, during the fall, day and night temperatures range between 18-30° C. and 15-21° C., respectively. Plant ratings were taken during the last week of November 2010. ‘NCORNSP-015SCPI’ has not been observed under all possible environmental conditions; therefore, the phenotype may vary with variations in the environment such as season, temperature, light intensity, day length, cultural conditions, and the like.

-   Classification:     -   -   Botanical name.—Ipomoea batatas (L.) Lam.         -   Common name.—Ornamental Sweetpotato         -   Variety name.—‘NCORNSP-015SCPI’         -   Growth conditions.—Ipomoea batatas ‘NCORNSP-015SCPI’ has             excellent vigor, a moderate growth rate, and is very             adaptable to container culture. In locales with mild winter             conditions, Ipomoea batatas ‘NCORNSP-015SCPI’ will grow             perennially; otherwise it is an annual plant. Similar to             cultivated sweetpotatoes, wind or rain rarely causes much             damage to ‘NCORNSP-015SCPI’, but if damage does occur, the             plant drops the damaged leaves and grows new shoots at nodes             where the leaves were lost. Under low light levels in a             greenhouse, ‘NCORNSP-015SCPI’ can develop intumescence,             which will remain on the affected foliage, but will be             outgrown with new foliage. -   Aboveground structure and coloration: — FIGS. 1 and 2 show the shape     and coloration of a typical specimen of Ipomoea batatas     ‘NCORNSP-015SCPI’. Color will vary somewhat due to temperature and     nutrient stress, which affect the anthocyanin pigments that produce     the dark purple color. Overall, this cultivar is a compact,     semi-upright, mounded, spreading herbaceous plant that has an     average height of 20.8 cm and an average area of spread of 45.0 cm.     The growth habit of this plant is to grow upright with shoots     growing outward. -   Branches:     -   -   Branching habitat.—Freely-branching with ˜3 lateral branches             coining off the stem. Very dense foliage and no pinching is             required to stimulate branching.         -   Vegetative lateral branches.—Length: ˜20.2 cm. Diameter:             ˜0.6 cm. Internodes are short with an average length of             ˜1.5 cm. Many lateral branches are formed and each axil has             latent shoots.         -   Stem.—Round and glabrous with an outward and upward bending             aspect and very strong, slightly flexible, non-brittle             strength. Color: Dark Purple (RHS N79A, N92A).         -   Petiole.—Length: ˜8.2 cm. Diameter: ˜0.3 cm. Color: Dark             Purple (RHS 187B). -   Foliage: — Leaves are alternate and tend to spiral around the stem.     They are simple and moderately divided into 3-5 lobes. Leaf shape is     somewhat variable as is size (see FIG. 2).     -   -   Quantity.—Heavily foliated, with ˜17 leaves per lateral             branch.         -   Mature leaf length.—˜13.3 cm.         -   Mature leaf width.—˜13.2 cm.         -   Leaf margin.—entire.         -   Central lobe width.—˜4.0 cm.         -   Central lobe length.—˜9.8 cm.         -   Mid-vein lobe length.—˜5.4 cm.         -   Mid-vein lobe width.—˜2.3 cm.         -   Central lobe shape.—Semi-elliptic.         -   Two axillaiy lobes.—Bipartite, both irregular lanceolate.         -   Leaf apex.—Acute to Acuminate.         -   Leaf base.—Cordate.         -   Leaf.—Glabrous texture and matte finish.         -   Venation.—Palmate at the base with arcuate veins in the             center lamina.         -   Color.—Leaves range from greyed green to burgundy purple as             they mature. See also Table 1.

TABLE 1 Leaf Structure Upper Surface Lower Surface Young Leaf Greyed green, N199B Greyed green, 148A with Purple blush, N77A Mature Leaf Dark purple, N186A Dark purple, 187A Vein- mature leaf N186B 187A Vein- young leaf 146C N77B at base fading to 146D at tip

-   Flowers: — Flowers occur under short day conditions, but the precise     photoperiod for flower induction is currently unknown. Solitary,     regular funnel-form flowers arising from leaf axils on secondary     lateral branches are formed. Corolla width: ˜3.8 cm, corolla length:     ˜4.8 cm. Limb color: Light lavender, 76C with white eye-zone, N155B.     The inner throat color gets lighter from base to limb going from     purple, 84A at the base to lavender, 84B near the limb. The limb is     rounded. The two outer sepals are shorter than the inner sepals. The     sepals are obovate with an obtuse apex and burgundy purple (RHS     N77A-N77B) in color. The stigma and style are both white (RHS 155C).     The stigma is exerted relative to the stamens. -   Storage root coloration: — Plants form no, to very small,     underground storage roots that are highly malformed and do not meet     USDA Sweetpotato Storage Root Grade Standards. Storage roots that do     form typically possess cream colored skin (161B) with hints of rose     (60A). Flesh color is cream (161A). -   Comparison with other Ipomoea batatas cultivars: — ‘NCORNSP-015SCPI’     is very distinct based on leaf color, leaf shape, and plant     architecture. Of the common cultivars of ornamental sweetpotato,     ‘NCORNSP-015SCPI’ is best compared with the ‘Sweet Caroline Purple’     cultivar (Table 2). Like ‘Sweet Caroline Purple’, ‘NCORNSP-015SCPI’     has purple leaves. However, the leaves of ‘NCORNSP-015SCPI’ are     darker purple and have 3-5 lobes compared to those of ‘Sweet     Caroline Purple’, which have 5-7. ‘NCORNSP-015SCPI’ has a compact,     semi-upright, mounding plant habit compared with the moderately     compact habit of ‘Sweet Caroline Purple’. Furthermore,     ‘NCORNSP-015SCPI’ holds it leaves upright compared with the slightly     curled leaves of ‘Sweet Caroline Purple’ resulting in a more upright     appearance. As compared with ‘Sweet Caroline Purple’,     ‘NCORNSP-015SCPI’ has a more upright, mounding, and fuller     appearance, making it more suitable for containerized propagation.     Unlike ‘Sweet Caroline Purple’, which rarely produces flowers,     ‘NCORNSP-015SCPI’ will produce flowers under short day conditions.

TABLE 2 Female Parent ‘NCORNSP- ‘NC1926- ‘Sweet Caroline Characteristic 015SCPI’ 001ORN’ Purple’ Plant Habit Compact, Semi- N/A Moderately Upright Compact Foliage Color Dark purple N/A Purple with green (RHS N186A- base (RHS 187A) N77A, 147A) Leaf Size Moderate N/A Moderate-Large Leaf Shape Moderately N/A Moderately Lobed, Lobed, 3-5 lobes 5-7 lobes

-   Disease or pest resistance: — ‘NCORNSP-015SCPI’ is susceptible to     Sweetpotato Feathery Mottle Virus and damage by Japanese beetles.     Its resistance or susceptibility to other known insects and     pathogens of sweetpotato is unknown. 

1. A new and distinct cultivar of Ipomoea batatas plant named ‘NCORNSP-015SCPI’, substantially as illustrated and described herein. 